JPH09322466A - Ac generator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance and to inhibit vibration by supporting a stator and rotor with front and rear brackets, forming air blowing means between a stator and a cooling cover covering the outer peripheral portion of the stator, and providing a cooling fin or heat transfer means o the inner periphery of the cooling cover. SOLUTION: A cooling cover 16 surrounding the outer peripheral portion of a stator core 7 is provided and is formed as part of a front bracket 9. A heat radiation fin 17 is provided in the inner peripheral portion of a cooling cover 16 and is formed in one united body with the front bracket 9 and the cooling cover 16. Front fins 34a and 34b provided inside the front bracket 9, and rear fins 35a and 35b are provided inside a rear bracket 10. A heat transfer member 27 is provided between the cooling cover 16 and the rear bracket 10. A rear fan 18 is provided at the side of the end face of rear bracket 10. A first front fan 19 is provided at the end face of the front bracket 9, and a second front fan 20 is provided at a portion projected out from the front bracket 9. Cooling wind flows from air blowing holes 21a and 21b in a manner as shown by arrows F1a to F6a and F1b to F6b, and each part is cooled off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle AC generator mounted on a vehicle such as an automobile, and particularly to a cooling method thereof.

[0002]

2. Description of the Related Art An alternator for a vehicle is a cylindrical fixed rotor which is energized by an exciting coil supplied with electric power from a storage battery and a rotor coil which is provided so as to surround the rotor. A front bracket and a rear bracket that rotatably support the rotor with a child through a bearing, and also support the stator in a fixed relative positional relationship with the rotor, and a voltage that adjusts the excitation voltage for power generation adjustment. It is composed of a regulator and a rectifier that converts an AC voltage induced in the stator coil into a DC voltage.

When the excited rotor rotates inside the stator by the driving force of the engine, induced electromotive force is generated in the stator coil. The induced AC voltage is converted into a DC voltage by the rectifier and supplied to the vehicle. The excitation voltage of the rotor is adjusted by a voltage regulator, and the amount of power generation is adjusted according to changes in the electric load of the vehicle.

As a conventional vehicle alternator, there is one disclosed in Japanese Utility Model Laid-Open No. 56-22968. In this vehicular AC generator, a cooling cover referred to as a branch outside of the frame is provided near the outer peripheral surface of the stator, and a cooling air flow path is formed in the space between the outer peripheral surface of the stator and the cooling cover.
Furthermore, the outer surface of the stator is undulated to increase the surface area. As a result, the outer peripheral portion of the stator having a large surface area is forcibly cooled to improve the cooling performance.

Another example of the vehicle AC generator is a vehicle AC generator described in Japanese Patent Laid-Open No. 4-364339. In this vehicle alternator, a vibration damping member having a thermal expansion coefficient larger than that of the stator core is filled between the outer peripheral surface of the stator and the bracket. When the vibration damping member thermally expands due to heat generation of the stator core, the bracket is levitated from the stator core to suppress noise generated by the vibration of the stator core being transmitted to the bracket.

[0006]

The following items are required for the vehicle alternator.

First, in order to cope with an increase in the electric load of a vehicle, a vehicle AC generator is required to have a high output. Secondly, since it is necessary to reduce the weight of the vehicle in order to suppress the fuel consumption of the vehicle, it is required to reduce the weight of the vehicle AC generator. Thirdly, with the increasing density of the vehicle engine room, it is necessary to reduce the installation space of the vehicle AC generator, and therefore the vehicle AC generator is required to be downsized.

The stator, the voltage regulator, and the rectifier are accompanied by heat generation during operation, but in order to maintain their functions, each of them must be kept at a certain temperature or lower. If the output is increased, the amount of heat generated by the stator, voltage regulator, rectifier, etc. will increase. In order to increase the output, between the magnetic poles of the rotor,
It is necessary to change the structure such as fitting a magnetic material. Then, inside the stator, that is, between the magnetic poles of the rotor,
Since it becomes difficult to create a cooling air flow in the axial direction, heat dissipation of the stator is hindered. Further, if the size is reduced, the heat radiation area is reduced and the temperature of each part is likely to rise. Therefore, it is necessary to improve the cooling performance of each part.

Further, the stator vibrates due to the magnetic excitation force acting between itself and the rotor, and generates noise. When the output is increased, the magnetic excitation force increases, and the vibration of the stator also increases. Further, if the weight is reduced, the structural members such as the front bracket and the rear bracket supporting the stator are thinned, so that the vibration of the stator is increased. Therefore, it is necessary to suppress the vibration of the stator.

That is, it is necessary to improve the cooling performance of each part and at the same time suppress the vibration of the stator.

In response to the above-mentioned demands for the vehicle alternator, the above-mentioned prior art has the following problems.

In the vehicle alternator disclosed in Japanese Utility Model Laid-Open No. 56-22968, firstly, no consideration is given to suppressing the vibration of the stator. Secondly, it is necessary to process the outer peripheral portion of the stator to make ups and downs, which increases the number of steps. Third, the cooling cover is not effectively used as a heat dissipation means. That is, the heat from the stator cannot be transferred to the cooling cover, and the cooling cover cannot efficiently dissipate the heat.

Further, in the vehicle AC generator described in Japanese Patent Laid-Open No. 4-364339, no consideration is given to heat radiation from the outer peripheral surface of the stator to the air, and heat radiation cannot be sufficiently performed. Therefore, the temperature of the stator rises.

Therefore, a first object of the present invention is to improve the cooling performance of an automotive alternator.

A second object of the present invention is to improve the cooling performance and suppress the vibration of the stator in the vehicle AC generator.

[0016]

The vehicle alternator of the present invention has a rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, and a rotating shaft for improving cooling performance. A stator that surrounds the rotor; front and rear brackets that are provided so as to sandwich the stator from the side that receives the rotational force of the rotating shaft and the opposite side thereof, and that rotatably support the rotating shaft; A cooling cover that covers the outer peripheral portion, and a blowing unit that blows air to the space between the stator and the cooling cover, wherein the radiation fins are provided on the inner circumference of the cooling cover, or between the stator and the cooling cover. A heat transfer means for transmitting heat between the outer circumference of the stator and the inner circumference of the cooling cover is provided in the space.

The radiating fins or the heat transfer means enhances the heat radiating efficiency from the cooling cover, and particularly the heat transfer means improves the heat transfer to the cooling cover. Therefore, if these are used in combination, the heat radiating efficiency from the cooling cover is further improved. Can be increased. At this time, the heat transfer means may also function as the heat dissipation fins, or all or part of the heat dissipation fins may be used as the heat transfer means. Further, the heat radiation fins may have a function of rectifying the fluid in the cooling cover.

The vehicle alternator of the present invention has a rotating shaft rotated by the engine of the vehicle and a rotor attached to the rotating shaft in order to improve the cooling performance and suppress the vibration of the stator. A stator that surrounds the rotor, front and rear brackets that are provided so as to sandwich the stator from the side receiving the rotational force of the rotating shaft and the opposite side thereof, and rotatably support the rotating shaft, A cooling cover that covers the outer peripheral portion of the stator, and a blowing unit that blows air to the space between the stator and the cooling cover. Radiating fins on the inner circumference of the cooling cover, or the stator and the cooling cover. A heat transfer means for transmitting heat between the outer circumference of the stator and the inner circumference of the cooling cover is provided in a space between the cooling cover and an elastic member between the cooling cover and the outer circumference of the stator.

The elastic member is partly provided in the space between the cooling cover and the outer periphery of the stator so as to secure a flow path of air or other fluid blown into the space between the cooling cover and the outer periphery of the stator. And is provided for the purpose of damping the vibration of the stator. At this time, the elastic member may be provided so as to be interposed between the heat transfer means and the stator. Alternatively, the heat radiation fins may be provided on all or part of the tips and connected to the stator.

The preferred embodiments of the present invention will be listed below.

(1) A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, and a side which receives the rotating force of the rotating shaft. And a vehicle alternating-current generator that is provided so as to be sandwiched from the opposite side thereof, includes front and rear brackets that rotatably support the rotating shaft, and that generates electric power by relative motion between the stator and the rotor, A cooling cover that covers the outer peripheral portion of the stator, a radiation fin on the inner periphery of the cooling cover, and a blowing unit that blows air to the space between the stator and the cooling cover are provided.

(2) A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, and a side which receives the rotating force of the rotating shaft. And a vehicle alternating-current generator that is provided so as to be sandwiched from the opposite side thereof, includes front and rear brackets that rotatably support the rotating shaft, and that generates electric power by relative motion between the stator and the rotor, Between a cooling cover that covers the outer peripheral portion of the stator, a blowing unit that blows air into the space between the stator and the cooling cover, and an outer periphery of the stator and an inner periphery of the cooling cover in the space. And a heat transfer means for transmitting heat.

(3) A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, and a side for receiving the rotating force of the rotating shaft. And a vehicle alternating-current generator that is provided so as to be sandwiched from the opposite side thereof, includes front and rear brackets that rotatably support the rotating shaft, and that generates electric power by relative motion between the stator and the rotor, A cooling cover that covers the outer peripheral portion of the stator, a radiation fin on the inner periphery of the cooling cover, a blowing unit that blows air into a space between the stator and the cooling cover, and a stator inside the space. A heat transfer unit that transfers heat between the outer circumference and the inner circumference of the cooling cover is provided.

(4) In any one of (1) to (3), an elastic member is provided between the cooling cover and the outer circumference of the stator.

(5) A rotating shaft rotated by the engine of the vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, and a side which receives the rotating force of the rotating shaft. And a vehicle alternating-current generator that is provided so as to be sandwiched from the opposite side thereof, includes front and rear brackets that rotatably support the rotating shaft, and that generates electric power by relative motion between the stator and the rotor, A cooling cover that covers the outer peripheral portion of the stator, a blowing unit that blows air into the space between the stator and the cooling cover, and an outer periphery of the stator and an inner periphery of the cooling cover in the space. A heat transfer means for transmitting heat between the stator and the outer circumference of the stator is provided via an elastic member having a high thermal conductivity.

(6) A rotating shaft that is rotated by the engine of the vehicle, a rotor attached to the rotating shaft, a stator that surrounds the rotor, and a side that receives the rotating force of the rotating shaft. And a vehicle alternating-current generator that is provided so as to be sandwiched from the opposite side thereof, includes front and rear brackets that rotatably support the rotating shaft, and that generates electric power by relative motion between the stator and the rotor, A cooling cover that covers the outer peripheral portion of the stator, a radiation fin on the inner periphery of the cooling cover, and a blowing unit that blows air into the space between the stator and the cooling cover, and in the space, A heat transfer unit that transfers heat between the outer circumference of the stator and the inner circumference of the cooling cover is connected to the outer circumference of the stator via an elastic member having a high thermal conductivity.

(7) In (5) or (6), the heat transfer means is formed integrally with the cooling cover as a convex shape having a longitudinal direction along the rotation axis.

(8) In (5) or (6), the heat transfer means is formed integrally with the cooling cover as a plurality of convex shapes arranged in the direction along the rotation axis and in the inner peripheral direction of the cooling cover. To be done.

(9) In any one of (1), (3), and (6), the heat radiation fin is integrated with the cooling cover and is a single fin in a direction along the rotation axis. Are provided in the inner peripheral direction of the.

(10) In any one of (1), (3) and (6), a plurality of the radiation fins are provided integrally with the cooling cover in a direction along the rotating shaft and in an inner circumferential direction of the cooling cover. It is provided as a fin.

(11) In any one of (1) to (10), a front fan is provided on the side of the rotor where the rotational force is transmitted to the rotary shaft, and a rear fan is provided on the opposite side, and the front fan is provided. A flow path of air sent to the outer peripheral part of the stator by a fan and a flow path of air sent to the outer peripheral part of the stator by the rear fan are separated and independent.

(12) In any one of (1) to (11), a radiation fin is provided inside one or both of the front bracket and the rear bracket. At this time, the radiating fins may have a function of rectifying the fluid in the bracket.

(13) In any one of (1) to (12), the cooling cover is provided with a hole for connecting an inner peripheral side and an outer peripheral side of the cover.

(14) In any one of (1) to (13), the rotor has a plurality of magnetic poles, and a magnetic material is fixed to a part or all of the magnetic poles.

(15) The pulley rotated by the engine of the vehicle, the rotary shaft rotating integrally with the pulley, the rotor fixed to the rotary shaft and excited by the exciting coil, and the rotor. A substantially cylindrical stator around which a surrounding stator coil is wound, a front bracket that supports the stator from the pulley side, and rotatably supports the rotary shaft via a bearing, and the stator And a rear bracket that supports the rotary shaft rotatably through a bearing while supporting the pulley from a side opposite to the pulley, and as a part of the front bracket and the rear bracket. A cooling cover formed by abutting the formed cooling cover parts so as to surround the outer peripheral part of the stator, and a direction along the rotating shaft that is integral with the cooling cover on the inner peripheral side of the cooling cover. A plurality of heat dissipating fins that are formed as one fin and are provided in the inner circumferential direction of the cooling cover, and a plurality of heat dissipating fins that are integral with the cooling cover and have a longitudinal direction in the direction along the rotation axis on the inner circumferential side of the cooling cover A plurality of convex portions provided in the inner circumferential direction of the cooling cover with the radiation fins sandwiched therebetween, an elastic member having a high thermal conductivity provided between the tip of the convex portion and the outer circumference of the stator, and a cooling cover. The holes provided at the both ends in the rotation axis direction for connecting the inner peripheral side and the outer peripheral side of the cover, the radiation fins on the inner wall surfaces of the front bracket and the rear bracket, and the front bracket and the rear bracket, respectively, An air flow path that extends from the inside of the bracket to the inside of the cooling cover, an outlet and an inlet for external air on the end faces of the front bracket and the rear bracket in the rotation axis direction, and the front and rear of the rotor in the rotation axis direction A front fan and a rear fan, respectively, by these fans, the air taken from the bracket outside is circulated in the bracket and the cooling cover through the suction port, is discharged from the discharge port to the bracket outside.

The elastic member is a member having a vibration damping effect, and when it is provided between the heat transfer means and the outer circumference of the stator, it has a high thermal conductivity so that heat can be transferred from the stator to the cooling cover. Use a member or material.

In the vehicle alternator of the present invention, it is preferable that a cooling air rectifying portion is provided on the inner peripheral portion of the cooling cover.

As for the shape of the heat radiation fins, the shape of the cross section perpendicular to the rotation axis may be rectangular wave. Further, the shape of the cross section perpendicular to the rotation axis may be rectangular wave-like, and the cross-sectional shape of the plane including the rotation axis may be rectangular wave-like,
In the case of the radiation fins having such a shape, the fins may be arranged in a staggered arrangement.

[0039]

1 is a longitudinal sectional view showing an embodiment of the structure of an automotive alternator according to the present invention.

First, the basic structure and basic functions of the vehicle alternator will be described with reference to FIG.

In FIG. 1, reference numeral 1 is a rotating shaft, which is a pulley 2, a rotor magnetic pole core 3, a rotor core 4, a slip ring 5a,
5b is fixed. A rotor coil 6 is wound around the rotor core 4. 7 is a stator core, around which a stator coil 8 is wound. The stator core 7 is supported between the front bracket 9 and the rear bracket 10. Further, the front bearing 11 provided on the front bracket 9 and the rear bracket 1
The rotary shaft 1 is rotatably supported by the rear bearing 12 provided at 0.

When an exciting voltage is supplied to the rotor coil 6 through the brushes 13a and 13b and the slip rings 5a and 5b, the rotor magnetic pole core 3 is excited. When the driving force from the engine is transmitted to the rotary shaft 1 via the pulley 2,
The rotor magnetic pole core 3 rotates in the stator coil 8.
Then, since the magnetic flux passing through the stator coil 8 changes, an induced electromotive force is generated in the stator coil 8. Since the generated current is AC, it is converted to DC by the rectifier 14 and supplied to the vehicle. The voltage regulator 15 operates according to the magnitude of the electric load of the vehicle, the excitation voltage supplied to the rotor coil 6 is adjusted, and an appropriate amount of power generation is maintained.

The stator coil 8, the rectifier 14, and the voltage regulator 15 are accompanied by heat generation during operation, but they must be kept below a certain temperature in order to maintain their functions.

The electromagnetic force acting between the rotor magnetic pole core 3 and the stator core 7 causes the stator core 7 to vibrate and generate noise. Hereinafter, this noise will be referred to as a magnetic sound. Since magnetic noise is offensive to the occupants of a car,
It is necessary to reduce the magnetic noise by suppressing the vibration of the stator core 7.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. An embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a longitudinal sectional view showing an embodiment of the vehicle AC generator of the present invention, and FIG. 2 is a transverse sectional view showing an embodiment of the vehicle AC generator of the present invention, that is, II-II in FIG. 'It is a sectional view.

In FIG. 1, a cooling cover 16 is provided so as to surround the outer peripheral portion of the stator core 7. At this time, the cooling cover 16 is formed as a part of the front bracket 9. Radiating fins 17 are provided on the inner peripheral portion of the cooling cover 16. The radiation fin 17 is integrally formed with the front bracket 9 and the cooling cover 16. Inside the front bracket 9, the front fins 34a, 3
4b, and the rear fin 35 is provided inside the rear bracket 10.
a and 35b are provided. Cooling cover 16 and rear bracket 1
A heat transfer member 27 is provided at the joint with 0. Heat transfer member 2
Silicon rubber is preferable as the material of 7, but the material is not limited to this.

As the above silicone rubber, zinc oxide,
It is preferable to use silicon rubber having a high thermal conductivity to which aluminum oxide, crystalline silica, boron nitride, graphite, etc. are added. The same applies to the silicone rubber used in the following examples.

A rear fan 18 is provided on the end surface of the rotor magnetic pole core 3 on the rear bracket 10 side. A first front fan 19 is provided on the end surface of the rotor magnetic pole core 3 on the front bracket 9 side.
A second front fan 20 is provided on a portion of the rotary shaft 1 that projects from the front bracket 9.

The rear fan 18 is preferably a centrifugal fan, the first front fan 19 is preferably an axial flow fan, and the second front fan 20 is preferably a centrifugal fan, but not limited to this. For example, the rear fan 18, the first front fan 19, and the second front fan 20 may all be axial fans.

Further, the rear fan 18, the first front fan 19,
All the second front fans 20 may be centrifugal fans.

The rear fan 18 may be an axial fan, the first front fan 19 may be an axial fan, and the second front fan 20 may be a centrifugal fan.

The rear fan 18 may be an axial fan, the first front fan 19 may be a centrifugal fan, and the second front fan 20 may be an axial fan.

The rear fan 18 may be a centrifugal fan, the first front fan 19 may be an axial fan, and the second front fan 20 may be an axial fan.

The rear fan 18 may be a centrifugal fan, the first front fan 19 may be a centrifugal fan, and the second front fan 20 may be an axial fan.

The rear fan 18 may be an axial fan, the first front fan 19 may be an axial fan, and the second front fan 20 may be a centrifugal fan.

Furthermore, for all the cases mentioned above,
Instead of the axial flow fan or the centrifugal fan, a mixed flow fan having the functions of the axial flow fan and the centrifugal fan may be used.

The cooling air flows from the outside of the rear bracket 10 into the rear axial ventilation holes 21a and 21b like F1a and F1b.
And flows in the axial direction of the rotary shaft 1, and at this time, the rectifier 14 and the voltage regulator 15 are cooled. At the same time, heat is also radiated from the inner peripheral portion of the rear bracket 10 and the rear fins 35a and 35b.

Further, the cooling air is, like F2a and F2b,
It flows from the inner peripheral side of the stator coil 8 toward the outer peripheral side, and flows into the space between the outer peripheral portion of the stator core 7 and the inner peripheral portion of the cooling cover 16 through the rear radial ventilation holes 22a and 22b. . At this time, the stator coil 8 is cooled.

Further, the cooling air is, like F3a and F3b,
Flowing in the space between the outer peripheral portion of the stator core 7 and the inner peripheral portion of the cooling cover 16 in the axial direction of the rotating shaft 1. At this time, the outer peripheral portion of the stator core 7 is cooled. In addition, the stator coil 8
The heat generated from the heat sources such as the stator core 7, the rectifier 14, the voltage regulator 15, and the like is transferred to the cooling cover 16 by heat conduction.
And transmitted to the radiation fin 17. Cooling air F3a, F3b
Thus, the heat from the above heat source is radiated through the inner peripheral portion of the cooling cover 16 and the heat radiation fins 17.

Further, the cooling air is, like F4a and F4b,
From the space between the outer peripheral portion of the stator core 7 and the inner peripheral portion of the cooling cover 16, through the front radial ventilation holes 23a and 23b,
It flows from the outer peripheral side of the stator coil 8 toward the inner peripheral side. At this time, the stator coil 8 is cooled again. At the same time, the inner periphery of the front bracket 9 and the front fins 34a, 34b
The heat is also released from.

Further, the cooling air is, like F5a and F5b,
The air flows out of the front bracket 9 in the axial direction of the rotary shaft 1 through the front axial ventilation holes 24a and 24b.

Further, the cooling air is, like F6a and F6b,
It flows in the radial direction of the rotating shaft 1.

FIG. 2 is a cross-sectional view taken along the line II-II 'of the vehicle AC generator shown in FIG. 1 and 2, the same parts are denoted by the same numbers.

In FIG. 2, a projection (convex portion) 25 is provided on the inner peripheral portion of the cooling cover 16. A heat transfer damping member 26 having high thermal conductivity and a vibration damping effect is provided between the outer peripheral portion of the stator core 7 and the protrusion 25. 2 heat transfer damping members
6 is preferably silicone rubber or the like, but is not limited to this. With the heat transfer damping member 26, the stator core 7
The vibration of can be dampened. In addition, the heat generated from the stator coil 8 and the stator core 7 is transferred to the heat transfer damping member 26.
The heat can be diffused to the cooling cover 16 and the radiation fins 17 via the.

FIG. 3 shows an example in which intermittent projections 55 forming heat radiation fins are provided on the inner peripheral portion of the cooling cover 16. As shown in FIGS. 3A and 3B, when the intermittent projection 55 is installed in the air flow, turbulence or vortex is generated around it. In this case, the intermittent protrusions 55 generate turbulence or vortices to increase the pressure loss, but a heat transfer promoting effect exceeding that occurs between the wall surface and the fluid. That is, heat is easily transferred from the high temperature air flow to the cooling cover 16 by the effect of promoting heat transfer, and the heat dissipation performance is improved. In this case, the intermittent projections 55 are arranged in a staggered pattern in FIG. 3, but they may be arranged irregularly. Also intermittent projection 5
The shape of No. 5 is an acute angle in FIG. 3, but a projection shape with rounded corners is also effective.

Further, FIG. 3B differs from FIG. 3A in that the heat transfer damping member 26 is attached to the tip of the intermittent projection 55 on the inner peripheral portion of the cooling cover 16. . At this time, if it comes into contact with the outer peripheral portion of the stator core 7, the vibration transfer force is dispersed together with the heat transfer promotion effect, and the damping effect is further increased.

As described above, with the configuration described with reference to FIGS. 1 and 2, the vibration of the stator core 7 can be damped by the heat transfer damping member 26.

At the same time, the heat generated from the stator core 7 and the stator coil 8 is diffused to the cooling cover 16 and the radiating fins 17 via the heat transfer damping member 26, and the cooling cover 16 and the radiating fins 17 are transferred to the air. Can dissipate heat. The heat radiation fins 17 can increase the surface area of the inner peripheral portion of the cooling cover 16 to promote heat radiation.

If the process for providing the radiation fins on the inner peripheral portion of the cooling cover 16 is not desired to be complicated, the radiation fins need not be provided in this way. Even in this case, the vibration damping effect of the stator core 7 and the cooling performance improving effect can be obtained at the same time.

The number of projections 25 and heat transfer damping members 26 provided is not limited to four. Any number of locations may be used as long as there is at least one location, and it may be determined according to the required vibration damping characteristics and cooling performance.

The length of the heat radiation fins 17 provided on the inner peripheral portion of the cooling cover 16 in the rotation axis direction is longer than the length of the heat radiation fins (known art) provided on the outer peripheral portion of the stator core 7 in the rotation axis direction. be able to. Therefore, the effect of increasing the heat dissipation area is high.

If the process of providing the heat transfer damping member 26 between the projecting portion 25 and the outer peripheral portion of the stator core 7 is uncomfortable, the heat transfer damping member 26 is not provided and the heat transfer damping member 26 is not provided. The portion 25 and the outer peripheral portion of the stator core 7 may be brought into direct contact with each other. Since the frictional damping between the projection 25 and the outer peripheral portion of the stator core 7 can be obtained, the vibration damping effect of the stator core 7 and the cooling performance improving effect can be simultaneously obtained in this case as well.

Further, the heat transfer member 27 can reduce the thermal resistance of the contact portion between the rear bracket 10 and the cooling cover 16. Therefore, the heat generated from the heat sources such as the rectifier 14 and the voltage regulator 15 can be diffused to the cooling cover 16 and the radiation fins 17 via the rear bracket 10 and the heat transfer member 27 to be radiated to the air. Further, the heat transfer member 27 has a function of filling a gap between the cooling cover 16 and the rear bracket 10, and also has an effect of preventing leakage of cooling air. Even if the rear bracket 10 and the cooling cover 16 are brought into direct contact with each other without providing the heat transfer member 27, the effect of the present invention is not significantly impaired.

At the same time, heat can be released from the outer peripheral portion of the stator core 7 to the air.

Front fins 34a, 34b and rear fin 35
The heat dissipation areas of the inner peripheral portions of the front bracket 9 and the rear bracket 10 can be increased by a and 35b. The front fins 34a, 34b and the rear fin 35
Even if a and 35b are not provided, the effect of the present invention is not significantly impaired.

Further, it is not necessary to process the outer peripheral portion of the stator core 7, and the number of steps for that does not increase.

Further, the cooling cover 16 and the radiation fins 17,
The front fins 34a and 34b and the rear fins 35a and 35b are
Since it is integrally formed with the front bracket 9 by a method such as casting, the number of parts and the number of processing steps are not increased. Since the rear fins 35a and 35b are also integrally formed with the rear bracket 10 by a method such as casting, the number of parts and the number of processing steps are not increased. The cooling cover 16, the radiation fins 17, the front fins 34a and 34b, the rear fins 35a, 3
The manufacturing method of 5b is not limited to casting.

Further, by providing three fans of the rear fan 18, the first front fan 19 and the second front fan 20 in order to create the flow of the cooling air, it is possible to obtain a sufficient flow rate and flow velocity of the cooling air. It is possible to improve the cooling performance. It is not necessary to provide all the three fans of the rear fan 18, the first front fan 19, and the second front fan 20, and if one or more of them are provided, a cooling air flow can be created. .

FIGS. 4A and 4B show another embodiment of the structure of the cooling cover of the embodiment shown in FIG. Note that, in (a) and (b), only a portion corresponding to the vicinity of the cooling cover in FIG. 1 is shown.

In FIG. 4 (a), in order to improve the cooling performance of the stator 7, the cooling air F3a (F3b) is positioned at the upstream position (the rear bracket side end of the cooling cover 16) along the flow F2a. Direction along flow F3a (rotational axis direction)
In addition, by providing the ventilation holes 44a (44b) in the cooling cover 16, the resistance of the ventilation passage formed between the outer peripheral portion of the stator 7 and the inner peripheral portion of the cooling cover 16 is reduced to increase the air volume,
And the ventilation holes 44a from which the air temperature from the outside has not risen
It can be taken from (44b). As a result, the cooling winds F1a (F1b), F2a (F
This can be achieved by reducing the temperature of 2b). Further, by providing ventilation holes 45a (45b) in the cooling cover 16 at a position upstream of the cooling air F4a (F4b) (end portion on the front bracket side of the cooling cover 16), F4a (F4b), F5a.
The ventilation resistance of (F5b) and F6a (F6b) can be reduced to increase the air volume, and air from the outside where the air temperature has not risen can be taken in through the ventilation holes 45a (45b). As a result, the front bracket 9 is cooled and, by extension, heat conduction from the stator 7 to the front bracket 9 is promoted.

On the other hand, in order to improve the cooling performance of the rectifier 14 (see FIG. 1) and the voltage regulator 15, as shown in FIG. 4B, the position of the cooling wind F2 downstream of the cooling cover 16 (rear bracket) By providing the ventilation holes 46a (46b) along the direction of the flow F2a (F2b) (the direction of the cooling air flowing into the cooling cover) at the side end portion, F1
This can be achieved by reducing the ventilation resistance of a and F2a and increasing the air volume. In addition, in order to reduce the ventilation resistance, not only the above-mentioned place but also the downstream portion of F3a (cooling cover 16
Vent holes 47a (47b) may be provided in the front bracket side end portion of the above) so as to be along the direction of the cooling air flowing in the cooling cover.

The stator 7 and the rectifier 14 (see FIG. 1)
In order to cool the voltage regulator 15 and the voltage regulator 15 at the same time, the ventilation holes 44 to 47 are appropriately provided in the cooling cover 16 in consideration of the characteristics of the fans 18 to 20 and the ventilation resistance. good.

Similar to the embodiment of FIG. 1, FIG. 4 (a),
In each embodiment of (b), the heat radiation fin shown in FIG. 3 may be used.

FIGS. 5A and 5B show another embodiment of the structure of the cooling cover of the embodiment shown in FIG. 5A and 5B, only the portion corresponding to the vicinity of the cooling cover in FIG. 1 is shown.

FIG. 5A shows an example in which the cooling cover 16 and the radiation fins 17 are integrally formed with the rear bracket 10. In some cases, the heat generated from the rectifier 14 (see FIG. 1) and the voltage regulator 15 may be preferentially dissipated. In this case, it is better to reduce the thermal resistance between the cooling cover 16 and the rear bracket 10 than the thermal resistance between the cooling cover 16 and the front bracket 9, and such a configuration is suitable.

It is desirable to provide a heat transfer member 28 at the joint between the cooling cover 16 and the front bracket 9. The material of the heat transfer member 28 is preferably silicon rubber or the like, but is not limited to this. The heat transfer member 28 is the cooling cover 1.
The heat resistance between the front bracket 9 and the front bracket 9 is reduced to some extent, and at the same time, the gap between the cooling cover 16 and the front bracket 9 is filled to prevent the cooling air from leaking. It should be noted that the cooling cover 16 and the front bracket 9 are provided without providing the heat transfer member 28.
The effect of the present invention is not greatly impaired even if the and are brought into direct contact with each other.

In FIG. 5 (b), the front cooling cover 16a integrally formed with the front bracket 9 and the rear cooling cover 16b integrally formed with the rear bracket 10 are butted against each other, whereby the outer peripheral portion of the stator core 7 is A cooling air flow path is provided in. Here, the front radiating fins 17a are integrally formed with the front bracket 9, and the rear radiating fins 17b are integrally formed with the rear bracket 10.

With such a structure, the front cooling cover 16
The length in the axial direction of the rotating shaft 1 of the a and the post cooling cover 16b can be made shorter than the length of the cooling cover 16 shown in FIG. 1 or 7. Therefore, the front cooling cover 1
Since the strength of 6a and the post-cooling cover 16b can be easily secured, the wall thickness can be reduced.

Here, the heat transfer member 29 may be provided at the abutting portion of the front cooling cover 16a and the rear cooling cover 16b. Silicon rubber or the like is suitable as the material of the heat transfer member, but the material is not limited to this. As a result, the thermal resistance between the front bracket 9 and the rear bracket 10 becomes small, so that the heat generated from the heat source such as the rectifier 14, the voltage regulator 15, the stator core 7, the stator coil 8 and the like is transferred to the front bracket 9. It can be uniformly diffused in the rear bracket 10, and effective heat dissipation can be performed from the surfaces of the front bracket 9 and the rear bracket 10. Further, the heat transfer member 29 has a function of filling the gap between the front cooling cover 16a and the rear cooling cover 16b, and also has an effect of preventing leakage of cooling air. Even if the front cooling cover 16a and the rear cooling cover 16b are brought into direct contact with each other without providing the heat transfer member 29, the effect of the present invention is not significantly impaired.

Similar to the embodiment of FIG. 1, FIG.
In each embodiment of (b), the radiating fins and the ventilation holes shown in FIGS. 3 and 4 may be used.

FIG. 6 shows another embodiment of the structure of the cooling cover of the embodiment shown in FIG. Incidentally, FIG.
In (a), only the portion corresponding to the vicinity of the cooling cover in FIG. 1 is shown, and in (b), the CC ′ cross section of (a) is shown as a whole.

In FIG. 6A, the cooling cover 16 is
It is provided as a component independent of the front bracket 9 and the rear bracket 10. The cooling cover 16 includes the fixing screws 30a to 30.
It fixes to the front bracket 9 and the rear bracket 10 using d. If the cooling cover integrally formed with the front bracket 9 or the rear bracket 10 is difficult to assemble, the cooling cover 16 may be an independent component in this way. Further, this embodiment is excellent in that the conventionally used front bracket 9 and rear bracket 10 can be diverted without a large change in shape.

The number of fixing screws 30a to 30d for fixing the cooling cover 16 is not limited to four, and any number may be used as long as the cooling cover 16 is fixed with sufficient strength. Further, in order to fix the cooling cover 16, an adhesive or the like may be used instead of using the fixing screws 30a to 30d.

Further, heat transfer members 31a and 31b may be provided at the joint between the cooling cover 16 and the front bracket 9 and at the joint between the cooling cover 16 and the rear bracket 10. Silicon rubber is preferable as the material of the heat transfer members 31a and 31b, but the material is not limited to this. Thereby, the thermal resistance between the front bracket 9 and the cooling cover 16 and the thermal resistance between the rear bracket 10 and the cooling cover 16 can be reduced. Therefore, the rectifier 14 (see FIG. 1), the voltage regulator 1
5, the heat generated from the heat sources such as the stator core 7, the stator coil 8 and the like can be diffused uniformly to the front bracket 9, the rear bracket 10 and the cooling cover 16, and heat can be effectively radiated. Like Also, the heat transfer member 30
The a and 30b have a function of filling the gap between the cooling cover 16 and the front bracket 9 and the gap between the cooling cover 16 and the rear bracket 10, and also have the effect of preventing leakage of cooling air.
In addition, the cooling cover 16 and the front bracket 9 are brought into direct contact with each other without providing the heat transfer members 31a and 31b, and the cooling cover 1
Even if 6 and the rear bracket 10 are brought into direct contact with each other, the effect of the present invention is not significantly impaired. Further, when it is convenient to reduce only the thermal resistance between the cooling cover 16 and the rear bracket 10, it is possible to provide only the heat transfer member 31b without providing the heat transfer member 31a. On the contrary, when it is convenient to reduce only the thermal resistance between the cooling cover 16 and the front bracket 9, it is possible to provide only the heat transfer member 31a without providing the heat transfer member 31b.

Next, with reference to FIG. 6B, the cooling cover 1
A description will be given of the cross-sectional structure near the stator core 7 when 6 is a component independent of the front bracket 9 and the rear bracket 10.

Cooling covers 16a, 16b, 16c, 1
A 6d four-division structure is used. Each cooling cover 16
a, 16b, 16c, 16d, and projections 25a, 25b,
25c and 25d are provided. Heat transfer damping members 26a, 26b, 26c, 26d are provided between the outer peripheral portion of the stator core 7 and the protrusions 25a, 25b, 25c, 25d. The materials and functions of the heat transfer damping members 26a, 26b, 26c, 26d are the same as those described above, and will not be described here. As shown in FIG. 6A, the front bracket 9 is usually provided with a front mounting leg 32, the rear bracket 10 is provided with a rear mounting leg 33, and the like. Therefore, if the cooling cover is made of a single cylindrical member, in the state where the front bracket 9, the stator core 7 and the rear bracket 10 are assembled,
Front mounting leg 32 (see FIG. 1) and rear mounting leg 33 (see FIG. 1)
Can interfere with the installation of the cooling cover.

Cooling covers 16a, 16b, 16c, 1
With the 6d four-divided structure, the cooling cover can be attached even when the front bracket 9, the stator core 7, and the rear bracket 10 are assembled.

The number of divisions of the cooling cover is not limited to four, and the same effect can be obtained if the number is two or more.

Similar to the embodiment of FIG. 1, FIG. 6 (a),
In the embodiment of (b), the radiating fins and the ventilation holes shown in FIGS. 3 and 4 may be used.

Another embodiment of the vehicle alternator of the present invention will be described with reference to FIGS. 7 (a) and 7 (b).

FIG. 7A is a vertical sectional view of this embodiment, showing a section taken along the line AA 'of FIG. 7B. (B)
Shows the BB 'cross section of (a). However, in this embodiment, the configuration of the fan is different from that of the embodiment of FIG. 1, and the flow of cooling air is different.

In FIG. 7A, a rear fan 36 is provided on the end surface of the rotor magnetic pole core 3 on the rear bracket 10 side. A front fan 37 is provided on the end surface of the rotor magnetic pole core 3 on the front bracket 9 side. It is preferable that both the rear fan 36 and the front fan 37 are centrifugal fans, but the present invention is not limited to this, and a mixed flow fan or an axial flow fan may be used.

In FIG. 7B, the cooling cover 16 is provided with partition portions 38a to 38d to divide the cooling air flow passage. Reference numerals 39a to 39d are rear cooling air flow passages for flowing the cooling air from the rear fan 36. Reference numerals 40a to 40d denote front cooling air flow passages for flowing cooling air from the front fan 37.

Returning to FIG. 7A, the flow of cooling air will be described.

F7 to F9 show how the cooling air flows from the rear bracket 10 side. First, the cooling air is passed through the rear axial ventilation holes 2
It flows from the outside of the rear bracket 10 toward the inside through the 1a. Next, the rear cooling air flow passage 39 is passed from the inside of the rear bracket 10 through the rear radial air passage hole 22a.
Run out to Further, the cooling air cools the outer peripheral portion of the stator core 7 and the inner peripheral portion of the cooling cover 16, and flows out to the outside.

F10 to F12 show how the cooling air flows from the front bracket 9 side. First, the cooling air flows from the outside of the front bracket 9 toward the inside through the front axial ventilation hole 24b. Next, it flows out from the inside of the front bracket 9 to the front cooling air flow passage 40 through the front radial ventilation hole 23b. Further, the cooling air cools the outer peripheral portion of the stator core 7 and the inner peripheral portion of the cooling cover 16, and flows out to the outside.

Thus, the rear cooling air flow passages 39a to 39d for flowing the cooling air from the rear fan 36 and the front cooling air flow passages 40a to 40d for flowing the cooling air from the front fan 37 are independent. The cooling air from the rear fan 36 and the front fan 3
It is possible to prevent the cooling air from 7 from interfering near the outer peripheral surface of the stator core 7. Therefore, the stator core 7
It is possible to increase the flow velocity of the cooling air near the outer peripheral surface of, and improve the cooling performance.

In this embodiment, the rear cooling air flow passage 39
Although a to 39d are provided at four locations in the circumferential direction and front cooling air flow paths 40a to 40d are provided at four locations in the circumferential direction, the number of each provided is not limited to this. The number of the rear cooling air flow passages may be one or more, and the number of the front cooling air flow passages may be one or more.

Similar to the embodiment of FIG. 1, FIG.
In the embodiment of (b), the radiation fin shown in FIG. 3 may be used.

Another embodiment of the vehicle AC generator of the present invention will be described with reference to FIGS. 8 (a) and 8 (b).

FIG. 8 (a) is a perspective view showing the rotor of the vehicle alternator of this embodiment, and FIG. 8 (b) shows the case of using the rotor of this embodiment and the conventional rotor. FIG. 6 is a vertical cross-sectional view of the vehicle alternator for showing the difference in the flow of cooling air from the case of using it.

In this embodiment, as shown in FIG.
The magnetic material 42 is fixed between the plurality of claw-shaped rotor magnetic pole cores 3. The configuration of the other parts is the same as that shown in FIG. This causes leakage from between the rotor magnetic pole cores 3,
The magnetic flux that does not contribute to power generation can be reduced, and the output of the vehicle alternator can be increased.

In the rotor of the conventional vehicle AC generator, since the magnetic material 42 is not provided, there is a space between the plurality of claw-shaped rotor magnetic pole cores 3. Therefore, FIG.
Like F13 and F14 in (b), the cooling air flowed through the space between the rotor magnetic pole cores 3 and the inner peripheral surfaces of the stator core 7 and the stator coil 8 were cooled. When the rotor 43 of the present embodiment shown in FIG. 8 (a) is used, the cooling air flow shown at F13 and F14 in FIG. 8 (b) almost disappears, and the stator core 7 and the stator coil 8 are not cooled. It becomes easy to become enough. However, in this embodiment, since the cooling air flow path is provided on the outer peripheral surface of the stator core 7, the stator core 7 and the stator coil 8 are sufficiently cooled.

That is, with the structure of this embodiment, the stator core 7 and the stator coil 8 are sufficiently cooled, and the leakage magnetic flux between the rotor magnetic pole cores 3 is reduced to improve the vehicle alternator. It can be output.

Similar to the embodiment of FIG. 1, in the embodiment of FIG. 8, the radiating fins and ventilation holes shown in FIGS. 3 and 4 may be used.

In each of the above embodiments, the following effects can be obtained.

Vibration of the stator core can be damped by the elastic member having high thermal conductivity.

At the same time, the heat generated from the heat transfer means stator core or the stator coil can be diffused to the cooling cover or the radiation fins through the heat transfer damping member and radiated from the cooling cover or the radiation fins to the air. it can. The radiating fins can increase the surface area of the inner peripheral portion of the cooling cover to promote heat radiation.

At the same time, heat can be released from the outer peripheral portion of the stator core to the air.

Further, it is not necessary to process the outer peripheral portion of the stator core, and the number of steps for this does not increase.

[0121]

According to the present invention, the following effects can be obtained.

Since the heat dissipating fins and / or heat transfer means are provided, the heat generated from the heat transfer means stator core or stator coil can be efficiently dissipated from the cooling cover, and the cooling performance is improved. A vehicle alternator can be provided.

Further, by providing the elastic member having high thermal conductivity, it is possible to provide the vehicle alternator in which the cooling performance is improved and the vibration of the stator core is reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a vehicle AC generator of the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of a vehicle AC generator of the present invention.

FIG. 3 is a partial perspective sectional view showing another embodiment of the cooling cover according to the present invention.

FIG. 4 is a partial vertical sectional view showing another embodiment of the cooling cover according to the present invention.

FIG. 5 is a partial vertical sectional view showing another embodiment of the cooling cover according to the present invention.

FIG. 6 is a partial vertical sectional view and a horizontal sectional view showing another embodiment of the cooling cover according to the present invention.

FIG. 7 is a vertical sectional view and a horizontal sectional view showing another embodiment of the cooling cover according to the present invention.

FIG. 8 is a perspective view and a vertical sectional view showing an embodiment of a rotor of the present invention.

[Explanation of symbols]

1 ... Rotary shaft, 2 ... Pulley, 3 ... Rotor magnetic pole core, 4 ... Rotor core, 5a, 5b ... Slip ring, 6 ... Rotor coil, 7 ... Stator core, 8 ... Stator coil, 9 ... Front Bracket, 10 ... Rear bracket, 11 ... Front bearing, 12 ...
Rear bearing, 13a, 13b ... Brush, 14 ... Rectifier, 1
5 ... Voltage regulator, 16, 16a to 16f ... Cooling cover,
Reference numeral 17 ... Radiating fins, 18 ... Rear fan, 19 ... First front fan, 20 ... Second front fan, 21a, 21b ... Rear axial ventilation holes, 22a, 22b ... Rear radial ventilation holes, 23a, 23
b ... Front radial ventilation holes, 24a, 24b ... Front axial ventilation holes, 25, 25a to 25d ... Protrusions, 26, 26a to 2
6d ... Heat transfer damping member, 27 ... Heat transfer member, 28 ... Heat transfer member, 29 ... Heat transfer member, 30a-30d ... Fixing screw, 31
a, 31b ... Heat transfer member, 32 ... Front mounting leg, 33 ... Rear mounting leg, 34, 35 ... Radiating fins, 36 ... Rear fan, 37
... front fan, 38a-38d ... partition part, 39a-
39d ... Rear cooling air flow passage, 40a-40d ... Front cooling air flow passage, 42 ... Magnetic material, 43 ... Rotor, 44-47
... Ventilation holes, 55 ... Intermittent projections, F1a-F5b ... Cooling air, F6-F14 ... Cooling air.

Front page continued (72) Inventor Shingo Yokoyama 502 Jinritsu-machi, Institute of Mechanical Engineering, Tsuchiura-shi, Ibaraki Prefecture Machinery Research Laboratory (72) Inventor Hiroshi Miyata 502, Jin-machi, Tsuchiura-shi, Ibaraki Prefecture Machinery Research Institute, Hitachi, Ltd. In-house

Claims (15)

[Claims] 1. A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, a side for receiving the rotating force of the rotating shaft, and It is provided so as to be sandwiched from the opposite side, and includes front and rear brackets that rotatably support the rotary shaft,
In a vehicular AC generator that generates electric power by relative movement between the stator and the rotor, a cooling cover that covers an outer peripheral portion of the stator, a radiation fin on an inner circumference of the cooling cover, the stator and the cooling An alternator for a vehicle, comprising: a blowing unit that blows air into a space between the cover and the cover. 2. A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, a side for receiving the rotating force of the rotating shaft, and It is provided so as to be sandwiched from the opposite side, and includes front and rear brackets that rotatably support the rotary shaft,
In a vehicle AC generator that generates electric power by relative motion between the stator and the rotor, a cooling cover that covers an outer peripheral portion of the stator, and a blowing unit that blows air into a space between the stator and the cooling cover. And a heat transfer unit that transfers heat between the outer circumference of the stator and the inner circumference of the cooling cover in the space. 3. A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, a side for receiving the rotating force of the rotating shaft, and It is provided so as to be sandwiched from the opposite side, and includes front and rear brackets that rotatably support the rotary shaft,
In a vehicular AC generator that generates electric power by relative movement between the stator and the rotor, a cooling cover that covers an outer peripheral portion of the stator, a radiation fin on an inner circumference of the cooling cover, the stator and the cooling For a vehicle, comprising: a blowing unit that blows air into a space between the cover and a heat transfer unit that transfers heat between the outer circumference of the stator and the inner circumference of the cooling cover in the space. AC generator. 4. The vehicular AC generator according to claim 1, further comprising an elastic member between the cooling cover and the outer periphery of the stator. 5. A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, a side for receiving the rotating force of the rotating shaft, and It is provided so as to be sandwiched from the opposite side, and includes front and rear brackets that rotatably support the rotary shaft,
In a vehicle AC generator that generates electric power by relative motion between the stator and the rotor, a cooling cover that covers an outer peripheral portion of the stator, and a blowing unit that blows air into a space between the stator and the cooling cover. A heat transfer means for transmitting heat between the outer circumference of the stator and the inner circumference of the cooling cover in the space, connected to the outer circumference of the stator through an elastic member having a high thermal conductivity. An alternator for vehicles, which is characterized by being equipped. 6. A rotating shaft rotated by an engine of a vehicle, a rotor attached to the rotating shaft, a stator surrounding the rotor, a side for receiving the rotating force of the rotating shaft, and It is provided so as to be sandwiched from the opposite side, and includes front and rear brackets that rotatably support the rotary shaft,
In a vehicular AC generator that generates electric power by relative movement between the stator and the rotor, a cooling cover that covers an outer peripheral portion of the stator, a radiation fin on an inner circumference of the cooling cover, the stator and the cooling With a blowing means for blowing air into the space between the cover and
In the space, a heat transfer means for transmitting heat between the outer circumference of the stator and the inner circumference of the cooling cover is connected to the outer circumference of the stator via an elastic member having high thermal conductivity. An alternator for vehicles, which is characterized in that 7. The vehicular AC generator according to claim 5 or 6, wherein the heat transfer means is formed integrally with the cooling cover as a convex shape having a longitudinal direction in a direction along the rotation axis. AC alternator for vehicles. 8. The vehicular AC generator according to claim 5 or 6, wherein the heat transfer means has a plurality of convex shapes arranged in a direction along the rotating shaft and in an inner peripheral direction of the cooling cover. An alternator for a vehicle, which is formed integrally with a cover. 9. The vehicle alternator according to claim 1, 3 or 6, wherein the heat radiation fin is integrated with the cooling cover and is a single fin extending in a direction along the rotation axis. A plurality of vehicle AC generators are provided in the inner peripheral direction of the cooling cover. 10. The vehicle alternator according to claim 1, 3 or 6, wherein the radiation fins are integrally formed with the cooling cover in a direction along the rotating shaft and an inner circumference of the cooling cover. An alternating current generator for a vehicle, which is provided as a plurality of fins in a direction. 11. The vehicular AC generator according to claim 1, further comprising a front fan on a side where rotational force is transmitted to the rotary shaft of the rotor and a rear fan on an opposite side thereof. For a vehicle, the flow path of air sent to the outer peripheral portion of the stator by the front fan and the flow path of air sent to the outer peripheral portion of the stator by the rear fan are separated and independent. AC generator. 12. The vehicle alternator according to any one of claims 1 to 11, wherein heat radiation fins are provided inside one or both of the front bracket and the rear bracket. AC generator for vehicles. 13. The vehicle alternator according to claim 1, wherein the cooling cover is provided with a hole that connects an inner peripheral side and an outer peripheral side of the cover. AC generator. 14. The vehicle alternator according to any one of claims 1 to 13, wherein the rotor has a plurality of magnetic poles, and a magnetic material is fixed to a part or all of the magnetic poles. AC alternator for vehicles. 15. A pulley rotated by an engine of a vehicle,
A rotary shaft that rotates integrally with the pulley, a rotor that is fixed to the rotary shaft, and is excited by an exciting coil;
A substantially cylindrical stator that surrounds the rotor and is wound with a stator coil; and a front bracket that supports the stator from the pulley side and rotatably supports the rotation shaft via a bearing. A vehicle alternator comprising: a rear bracket that supports the stator from a side opposite to the pulley, and a rotatably support the rotating shaft via a bearing, the front bracket and the rear bracket. The cooling covers formed as a part of the cooling cover are butted against each other, and the cooling cover is configured to surround the outer peripheral portion of the stator. A plurality of heat dissipating fins that are formed as one fin and are provided in the inner circumferential direction of the cooling cover, and a longitudinal direction in the direction along the rotation axis that is integral with the cooling cover on the inner circumferential side of the cooling cover. A plurality of protrusions provided in the inner circumferential direction of the cooling cover with the plurality of heat radiation fins sandwiched therebetween, and an elastic member having a high thermal conductivity provided between the tip of the protrusion and the outer periphery of the stator. And provided on both ends of the cooling cover in the rotation axis direction,
Holes that connect the inner and outer peripheries of the cover, heat dissipation fins on the inner walls of the front and rear brackets, and air passages that connect the front and rear brackets from the inside of the bracket to the inside of the cooling cover. And an exhaust port and an intake port for external air on the end faces of the front bracket and the rear bracket in the rotation axis direction, and a front fan and a rear fan at the front and rear of the rotor in the rotation axis direction, respectively. An AC generator for a vehicle, characterized in that air sucked from the outside of the bracket through the suction port is circulated in the bracket and the cooling cover and is discharged from the exhaust port to the outside of the bracket.